1817.] GENUS CATO?.TOMUS. 107 



the determination of the identity of the catostomus and his 

 Piscataqua fish. 



14. C. Hudsonius. Cypriniis Catostomus. Pinna ani 

 radiis 8; labio imo caruncula bilobata papillosa, cauda 

 bifida. 



Pinna D. 12.— P. 17— V. 10— IL— A. 8.— C. 17. 



Habitat in Sinus Hudsonisfiumhiibus copiose, su^endo 

 pascitur. 



Anglis the Sucker. Royal Society Trans, vol. 63, 

 page 155, tab. 6. 



Head broader than the body, gradually decreasing to- 

 wards the nose, full of elevations and tubercles, nearly 

 quadrangular; mouthnot far from the extremity of the snout; 

 ei/es large; on the snout are about five round prominent 

 tubercles; the head has several sutures; over each eye, in 

 a cavity, are two longitudinal sutures, joined opposite the 

 nostrils by a still shorter transverse one; on the covers of 

 the gills are two, on each side one, beginning near the 

 * lobes of the caruncula of the under lip, and going up 

 arched towards the eye. Near the extremity of the snout 

 begins on each side a longitudinal one; it passes under the 

 eye, and mounts in a curvature behind it, then it goes 

 straight to the end of the head, where it again gets down- 

 wards, and joins the lateral line; the scales are small near 

 the head and back, increasing in size towards the middle 

 and tail, close to which they are again smaller; dorsal Jin 

 rhomboidal; pectoral Jins lanceolated, iixed under the 

 covers of the gills, and measure in length a fourth part of 

 the fish, estimated from the setting on of the head to the 

 base of the caudal fin; body pale silvery; caudal Jin concave 

 or lunated. Length sixteen inches. 



